Description:
------------
If a PHP CLI scripts starts with a shebang and contains a namespace declaration, executing it via stdin incorrectly raises a fatal error stating the NS declaration must be the first thing in the file. This is a relatively common thing to do when, for example, trying to lint a file in a commit hook (git show ... | php -l)

Test script:
---------------
eric@Eric-MBP ~: cat testcase.php 
#!/usr/bin/env php
<?php

namespace Boris;

eric@Eric-MBP ~: php -l testcase.php 
No syntax errors detected in testcase.php

eric@Eric-MBP ~: cat testcase.php | php -l

Fatal error: Namespace declaration statement has to be the very first statement in the script in - on line 4

Errors parsing -


Expected result:
----------------
No error, return code 0. This is what happens if the file does not contain the leading shebang.

Actual result:
--------------
Fatal error:  Namespace declaration statement has to be the very first statement in the script